Dinaphthylamin sulfo derivative and process of making same.



turn Srarns PATENT union.

.lOllANN BAMMANN AND YVALTER VORSTER, OF ELBERFELD, GERMANY ASSIGNORS TO THE FARBENFABRIKEN OF ELBERFELD COMPANY, OF

NEXV YORK.

DINAPHTHYLAMIN SULFO DERIVATIVE AND PROCESS OF MAKING SAMl-l.

SPECIFICATION formingpart of Letters Patent No. 649,714, dated May 15, 1900; Application filed February 17,1900. Serial No. 5,601. (spcciniena) T1) (LZZ whom it may concern:

Be it known that we, JOHANN BAMMANN and YVALTER VORSTER, doctors of philosophy, 5 chemists, (assignors to the FARBENFABRIKEN on ELBERFELD COMPANY, of New York,) residing at Elberfeld, Germany, have invented a new and useful Improvement in Dinaphthylamin Compounds; and we hereby declare the following to be a clear and exact description of our invention.

Our invention relates to the production of a new sulfo derivative of beta-dinaphthyl amin having the following formula-i r l l dn o'n The process for producing this body consists z 5 in heating beta -amido-alpha -naphthol-beta monosulfonic acid with a watery solution of sodium bisulfite. l he new reaction proceeds as follows: A condensation of two molecules of the above-named oxynaphthylamin sul- 3o fonic acid takes place under evolution of one molecule of ammonia, the above-defined betadinaphthylamin derivative being thus formed according to the following equation:

on OIH 3 5 The dinaphthylamin compound thus obtained may be employed for the manufacture of valuable azo dyestuffs.

In carrying out our new process practically we can proceed as follows, (the parts being by 40 weight:) A mixture prepared from two hundred parts of beta ami(lo-alpha -naphtholbeta -monosulfonic acid and two hundred parts of hot water is dissolved in caustic soda lye. In a vessel lined with lead and provided with a stirrer and a reflux condenser the solution thus obtained is mixed with seven hundred parts of a sodium-bisulfite solution of 33 Baum and then heated at from 80 to 100 centigrade until a diluted test portion 5owhen mixed with an excess of hydrochloric acid (even when allowed to stand for a while) is found to yield no longer a precipitate of beta amido-alpha naphthol beta sulfonic acid. Subsequently the reaction mixture is 5 5 strongly acidulated by means of hydrochloric l r on on acid. On cooling a large quantity of a crystab line nearly -white mass separates. It is filtered off, dissolved in a small quantity of water, and again precipitated by the addition of an excess of hydrochloric acid. The new dioxy- 6o dinaphthylamin disulfonic acid thus produced forms white needles. It has the abovegiven formula. The free acid as well as the alkaline salts thereof are very readily soluble in water. The dioxydinaphthylamin disul- 6 5 fonic acid thus obtained is capable-of combinin g with one and likewise with two molecules of diazo compounds. On the addition of a small quantity of a watery solution of ferric chlorid to its watery solution a stable yellowish-orange color is produced, while a dirty yellowishbrown precipitate is obtained on the addition of more ferric ohlorid. \Vith a small quantity of a watery solution of bleaching-powder a reddish-orange color is formed, which quickly turns into a slight yellow. If an excess of the Watery solution of bleachingpowder is employed, a dirty-brown color is obtained, which quickly turns into olivebrown. After a short while the liquid becomes clear and assumes then a yellowishorange color.

Having now described our invention and in what manner the same is to be performed,

what we claim as new, and desire to secure bywhich is awhitish crystalline substance, very readily soluble in water and capable of combining with one and likewise with two molecules of diazo compounds, substantially as described before.

In testimony whereof we have signed our names in the presence of two subscribing witnesses.

so rr NH I so,ti WA \Am/ i l 2 S JOHANN BAMMANN. WALTER VORSTER.

\Vitnesses:

OTTO KONIG, F. A. RITTERSHAUS. 

